Engraving-machine.



A. ROSTAD.

q ENGRAVING MACHINE.

APPLICATION TILED DEG.21, 1908.

. 934 216 r I Patented Sept. 14,1909.

ARNT ROSTAD, OF DRONTHEIM, NORWAY UNITED STATES PATENT OFFICE.

, ASSIGNOR 0F ONE-HALF T0 ARTHUR DAVID- ANDERSON, OF GHRIS'IIANIA,NORWAY.

ENGRAVING-MACHIN E.

To all whom it may concern:

Be it known that I, ARNT RosTAD, a subject of the King of Norway,residing at Drontheim, Norway, have invented certain new and usefulImprovements in Engraving- Machines; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to letters of reference marked thereon, which form a part of thisspecification.

My invention relates to means for carrying out that kind of engraving orincision work performed by silversmiths for obtaining ornaments of adull appearance on plane surfaces. This kind of work is at present, asfar as I know, carried out by hand, the tool used being a small chisel(or engraving needle) with a flat point; this chisel is moved along thesurface to be provided with ornaments and simultaneously therewithimparted a rocking movement, so that a continuous incision line is madeconsisting of an uninterrupted series of short fine lines runningtransversely to the direction, in which the tool is moved over thesurface.

My invention consists in a device, whereby the chisel is imparted itsrocking motion by mechanical means, for instance by way of an electricmotor, connected by means of a flexible shaft with the toolholder.

In the annexed drawing I have shown a form of such device, as I preferto carry it out.

Figure l is an axial sectional view and Fig. 2 a plan view of thedevice; Fig. 3 is a cross section Fig. 4 is a rear view of the back partof the device and Fig. 5 is a diagrammatic illustration of an incisionline produced by the device.

(4 indicates the chisel which is held in the thick part b of therockshaft d by the screw 0. At the other end the rockshaft carries a.

bifurcated arm it, fixed to the shaft by a screw 9. These parts areinclosed in a casing 6, the latter serving as a bearing for the thickpart Z; of the shaft, as shown; at the other end the shaft rests againsta screw f,

entering the casing through the head or.

cover 25 of the same.

r 1s a flexible shaft, surrounded 1n a usual way by a flexible tube 9;the latter is adjust- Specification of Letters Patent.

Application filed December 21, 1908.

Patented Sept. 14:, 1909. Serial No. 468,526.

[ ably held in a slot at in the cover 25. On the end of the shaft 7 isfixed a disk j with a crank pin is entering the bifurcation of the armh. The rotation of the flexible shaft 1 will cause a rocking motion ofthe arm 7t and shaft (Z with the chisel, and it is obvious, that aregulation of the motion of the chisel will be effected by simplyadjusting the shaft 1 in the slot u.

The casing serves as a handle for manipulating the tool, the operatorhaving only to mow e the tool along the surface in order that therequired incisions shall be obtained.

In some cases it is required that the incisions are made in a certaindistance from and parallel with an edge of the object. To facilitatethis kind of Work, a rod m with a screw Z is adjustably fixed by way ofa screw 0 in a sleeve 11, which latter is adjustably mounted on thecasing e by way of a screw 7). When doing such work the end of the screwZ is held against the edge of the object, thereby steadying the tool.

I claim as my invention:

1. In an engraving machine, a chisel, a holder for the same, meanswhereby to the latter is imparted a rocking movement and a casing inwhich the parts are mounted and serving as a handle for manipulating themachine.

2. In an engraving machine, -a chisel, a holder for the same, a bearingfor the holder, an arm having a slot therein on the holder, a drivingshaft, a crank 011 the latter, the pin of which enters the slot in thesaid arm, and a casing in which the parts are mounted and which servesas a handle for manipulating the machine.

3. In an engraving machine, a chisel, a holder for the same, meanswhereby to the latter is imparted a rocking movement, a casing in whichthe parts are mounted and which serves as a handle for manipulating themachine and a guide rod adjustably mounted on the said casing for thepurpose specified.

In testimony that I claim the foregoing as my invention, I have signedmy name in presence of two subscribing witnesses.

ARNT ROSTAD.

lVitnesses:

SVIRRI BERG, M. GRAM. p

